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Princess cut diamond lab grown white D COLOR VVS2 BEST DIAMOND FOR ALL SIZE 1.00 CARAT diamond, a mineral composed of pure carbon. It is the hardest naturally occurring substance known; it is also the most popular gemstone. Because of their extreme hardness, diamonds have a number of important industrial applications JEWELLERY. ... INDUSTRIAL DIAMONDS. ... AUTOMOTIVE INDUSTRY. ... Windows. ... Medicine. ... Engraving. ... Audio equipment. ... Beauty products. Diamond is the hardest material on the qualitative Mohs scale. To conduct the quantitative Vickers hardness test, samples of materials are struck with a pyramid of standardized dimensions using a known force - a diamond crystal is used for the pyramid to permit a wide range of materials to be tested. From the size of the resulting indentation, a Vickers hardness value for the material can be determined